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https://rdcu.be

Performance

· 17 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
73
GRADE
C
FIX
5
REVIEW
3
PASS
7
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop
37
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
82
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
77
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
62
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

5.35 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

20.65 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

932 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.011

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

7.53 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

28.21 s

Page Load Progression

423 ms
845 ms
1.3 s
1.7 s
2.1 s
2.5 s
3.0 s
3.4 s
Checks
17
7 PASS 3 REVIEW 5 FIX
F
Page Weight Budget
Action
6.2 MB transferred, 116 requests
FIX
6.2 MB transferred, 116 requests
Critical::
Page weighs 8.9 MB (6.2 MB transferred)
Warning::
Images are 4.7 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 4.7 MB
Warning::
JavaScript is 832 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 832 KB
Info::
Fonts are 485 KB — consider subsetting or using system fonts
Subset fonts to include only used characters, or switch to system font stacks.
Got: 485 KB
Info::
CSS is 210 KB — consider purging unused styles
Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.
Got: 210 KB
Warning::
116 HTTP requests — consider bundling or reducing
Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.
Info::
Estimated 1.3 g CO2 per page load
6.2 MB / 2.4 MB budget
6.2 MB transferred
116 requests
1.3 g CO2 per page load
Images 4.7 MiB 75%
JavaScript 832.4 KiB 13%
Fonts 484.5 KiB 8%
CSS 210.1 KiB 3%
Other 39.2 KiB 1%
HTML 20.6 KiB 0%
Other 3.4 KiB 0%
Other 3.3 KiB 0%
0 2.4 MB 4.9 MB
Over budget

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

Subset fonts to include only used characters, or switch to system font stacks.

Why this matters

Font payload is large — subset to used glyphs only, or fall back to system fonts (zero load time).

Source: web.dev font loading

Remove unused CSS rules with tools like PurgeCSS to reduce stylesheet size.

Why this matters

CSS bundle is large — purge unused styles (PurgeCSS, Tailwind JIT) to reduce CSS payload.

Source: web.dev

Each request adds latency. Bundle small files, use sprites, or eliminate unnecessary requests.

Why this matters

High HTTP request count — bundling, sprite-ing, and HTTP/2 server push can reduce per-request overhead.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (6.2 MiB of 6.2 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
F
JS Execution Cost
Action
7719ms total JS execution
FIX
7719ms total JS execution
Warning::
https://www.readcube.com/: 1782ms CPU time
Warning::
Unattributable: 1037ms CPU time
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MCT...: 763ms CPU time
Warning::
https://unpkg.com/gsap@3/dist/ScrollTrigger.min.js: 661ms CPU time
Warning::
https://unpkg.co/gsap@3/dist/gsap.min.js: 636ms CPU time
Warning::
Third-party scripts: 7719ms (100% of total)

Main Thread Breakdown

Script Evaluation 38% Other 25% Style & Layout 20% Script Parsing & Compilation 6% Rendering 5% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.readcube.com/1782ms100ms18ms3rd
Unattributable1037ms18ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MCT77F4P763ms673ms81ms3rd
https://unpkg.com/gsap@3/dist/ScrollTrigger.min.js661ms141ms0ms3rd
https://unpkg.co/gsap@3/dist/gsap.min.js636ms62ms12ms3rd
https://www.readcube.com/cdn-cgi/challenge-platform/scripts/jsd/main.js484ms454ms4ms3rd
https://www.googletagmanager.com/gtag/js?id=G-FMT5SQJ46L&cx=c&gtm=4e64k0459ms366ms90ms3rd
https://cdn.cookielaw.org/scripttemplates/202601.2.0/otBannerSdk.js457ms274ms91ms3rd
https://www.readcube.com/wp-includes/js/jquery/jquery.min.js?ver=3.7.1437ms310ms13ms3rd
https://www.googletagmanager.com/gtag/js?id=AW-1009772145&cx=c&gtm=4e64k0374ms242ms83ms3rd

Showing top 10 of 16 scripts

D
Page Weight Inventory
Action
116 resources · 6.2 MB · 196 KB savings available
FIX
116 resources · 6.2 MB · 196 KB savings available
Warning::
Page weight 5.2 MB over 1MB target
Got: 6.2 MB Expected: ≤ 1 MB
Info::
~196 KB of savings available
Warning::
115 third-party resources (100% of weight)
Info::
8 resources over 200KB
116 resources · 6.2 MiB · 115 third-party 5.2 MiB over 1MB target
Image 75% · 4.7 MiB
JavaScript 13% · 832.4 KiB
Font 8% · 484.5 KiB
CSS 3% · 214.8 KiB
Other 1% · 38.7 KiB
Document 0% · 20.7 KiB

~196.0 KiB of savings available

Remove unused JavaScript: 196.0 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

B
Image Optimization
26 images, 0 KB saveable
REVIEW
26 images, 0 KB saveable
Info::
All images are well-optimized
26 images 4.7 MB
0 oversized -0 KB
14 legacy format
0 missing dimensions CLS risk
C
JS Bundles
Action
36 scripts, 196 KB unused
REVIEW
36 scripts, 196 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-FMT5...: 69 KB unused (40%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=AW-100...: 64 KB unused (44%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-MCT...: 63 KB unused (41%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 196 KB
196 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-FMT5SQJ46L&cx=c&gtm=4e64k0173 KB69 KB (40%)✓3rd
https://www.googletagmanager.com/gtag/js?id=AW-1009772145&cx=c&gtm=4e64k0146 KB64 KB (44%)✓3rd
https://www.googletagmanager.com/gtm.js?id=GTM-MCT77F4P154 KB63 KB (41%)✓3rd
https://www.readcube.com/wp-content/plugins/bb-plugin/js/libs/jquery.magnificpopup.min.js?ver=2.10.0.69 KB—✓3rd
https://www.readcube.com/wp-content/plugins/event-tickets/build/js/rsvp.js?ver=5.27.41 KB—✓3rd
https://unpkg.com/gsap@3.15.0/dist/gsap.min.js28 KB—✓3rd
https://www.readcube.com/wp-content/plugins/bb-plugin/js/libs/jquery.imagesloaded.min.js?ver=2.10.0.63 KB—✓3rd
https://www.readcube.com/wp-includes/js/masonry.min.js?ver=4.2.29 KB—✓3rd
https://www.readcube.com/wp-content/plugins/betterdocs/assets/blocks/categorygrid/frontend.js?ver=a4a7e7ed1fd9a2aaf85a1 KB—✓3rd
https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/js/user-agent.js?ver=da75d0bdea6dde3898df1 KB—✓3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
Font Loading
9 fonts (485 KB)
PASS
9 fonts (485 KB)
Info::
9 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

9

485 KB total

Render-blocking

0

of 9

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 5.4 s LCP 20.6 shttps://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-solid-900.woff2 — 77.2 KiB — 184 ms — font-display: swaphttps://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-regular-400.woff2fa-regular-400.woff2 https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-regular-400.woff2 — 13.6 KiB — 173 ms — font-display: swaphttps://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-brands-400.woff2 — 75.7 KiB — 184 ms — font-display: swapdata:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA…x-font-woff;charset=utf... data:application/x-font-woff;charset=utf-8;base64,d09GRgABAAAAAHvwAAsAAAAA3EgAAQAAAAAAAAAAAAAAAAAAA… — 31.0 KiB — 94 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2pxiEyp8kv8JHgFVrJJfecnF... https://fonts.gstatic.com/s/poppins/v24/pxiEyp8kv8JHgFVrJJfecnFHGPc.woff2 — 7.7 KiB — 38 ms — font-display: swaphttps://www.readcube.com/wp-content/plugins/megamenu-pro/icons/fontawesome6/webfonts/fa-solid-900.woff2fa-solid-900.woff2 https://www.readcube.com/wp-content/plugins/megamenu-pro/icons/fontawesome6/webfonts/fa-solid-900.woff2 — 147.3 KiB — 212 ms — font-display: swaphttps://www.readcube.com/wp-content/plugins/megamenu-pro/icons/fontawesome6/webfonts/fa-brands-400.woff2fa-brands-400.woff2 https://www.readcube.com/wp-content/plugins/megamenu-pro/icons/fontawesome6/webfonts/fa-brands-400.woff2 — 108.0 KiB — 120 ms — font-display: swaphttps://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWuYjalmUiAr0lFQm.woff2KFOMCnqEu92Fr1ME7kSn66a... https://fonts.gstatic.com/s/roboto/v51/KFOMCnqEu92Fr1ME7kSn66aGLdTylUAMQXC89YmC2DPNWuYjalmUiAr0lFQm.woff2 — 16.4 KiB — 9 ms — font-display: swaphttps://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2pxiByp8kv8JHgFVrLCz7Z1x... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 7.7 KiB — 5 ms — font-display: swap
fa-solid-900.woff2 woff2 swap
Size 77 KB
Load time 184 ms
Start 572 ms
Risk FOUT — text flashes from fallback to web font
fa-regular-400.woff2 woff2 swap
Size 14 KB
Load time 173 ms
Start 573 ms
Risk FOUT — text flashes from fallback to web font
fa-brands-400.woff2 woff2 swap
Size 76 KB
Load time 184 ms
Start 574 ms
Risk FOUT — text flashes from fallback to web font
x-font-woff;charset=utf... woff swap
Size 31 KB
Load time 94 ms
Start 893 ms
Risk FOUT — text flashes from fallback to web font
  • Convert to woff2 for ~30% smaller file size
pxiEyp8kv8JHgFVrJJfecnF... woff2 swap
Size 8 KB
Load time 38 ms
Start 959 ms
Risk FOUT — text flashes from fallback to web font
fa-solid-900.woff2 woff2 swap
Size 147 KB
Load time 212 ms
Start 960 ms
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
fa-brands-400.woff2 woff2 swap
Size 108 KB
Load time 120 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
  • Subset this font — over 100 KB suggests Latin Extended or full glyph coverage that most pages don't need
KFOMCnqEu92Fr1ME7kSn66a... woff2 swap
Size 16 KB
Load time 9 ms
Start 1.1 s
Risk FOUT — text flashes from fallback to web font
pxiByp8kv8JHgFVrLCz7Z1x... woff2 swap
Size 8 KB
Load time 5 ms
Start 2.4 s
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)

Fixing the unchecked items could save ~137 KB and ~274 ms

A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
5 hints, 0 missing preconnects
PASS
5 hints, 0 missing preconnects
Info::
Page uses 5 resource hint(s)

Current Resource Hints

preconnect
1
preload
3
dns-prefetch
1
prefetch
—

5 resource hints configured

A+
Render-Blocking Resources
No render-blocking resources detected
PASS
No render-blocking resources detected
Info::
No render-blocking resources detected in <head>
A+
Third-Party Resources
No third-party resources detected
PASS
No third-party resources detected
Network Waterfall
116 requests over 2472ms
INFO
0 ms 2.0 s 4.0 s 6.0 s 8.0 s 10.0 s 12.0 s 14.0 s 16.0 s 18.0 s 20.0 s FCP 5.4 s LCP 20.6 shttps://rdcu.be// https://rdcu.be/ — 302 — 153 B — 298 ms — h2https://www.readcube.com/www.readcube.com/ https://www.readcube.com/ — 200 — 20.6 KiB — 253 ms — h3https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-solid-900.woff2www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-solid-900.woff2 — 200 — 77.2 KiB — 184 ms — h3https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-regular-400.woff2www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-regular-400.woff2 — 200 — 13.6 KiB — 173 ms — h3https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-brands-400.woff2www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/webfonts/fa-brands-400.woff2 — 200 — 75.7 KiB — 184 ms — h3https://www.readcube.com/wp-includes/css/dashicons.min.css?ver=6.9.4www.readcube.com/wp-includes/css/da... https://www.readcube.com/wp-includes/css/dashicons.min.css?ver=6.9.4 — 200 — 35.5 KiB — 54 ms — h3https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/variables-skeleton.css?ver=6.10.3www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/variables-skeleton.css?ver=6.10.3 — 200 — 1.7 KiB — 70 ms — h3https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/variables-full.css?ver=6.10.3www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/variables-full.css?ver=6.10.3 — 200 — 1.3 KiB — 41 ms — h3https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/common-skeleton.css?ver=6.10.3www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/common-skeleton.css?ver=6.10.3 — 200 — 3.4 KiB — 73 ms — h3https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/common-full.css?ver=6.10.3www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/the-events-calendar/common/build/css/common-full.css?ver=6.10.3 — 200 — 5.6 KiB — 76 ms — h3https://www.readcube.com/wp-content/plugins/event-tickets/build/css/tickets.css?ver=5.27.4www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/event-tickets/build/css/tickets.css?ver=5.27.4 — 200 — 5.4 KiB — 64 ms — h3https://www.readcube.com/wp-content/plugins/event-tickets/build/css/rsvp-v1.css?ver=5.27.4www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/event-tickets/build/css/rsvp-v1.css?ver=5.27.4 — 200 — 4.3 KiB — 82 ms — h3https://www.readcube.com/wp-includes/css/dist/block-library/style.min.css?ver=6.9.4www.readcube.com/wp-includes/css/di... https://www.readcube.com/wp-includes/css/dist/block-library/style.min.css?ver=6.9.4 — 200 — 17.9 KiB — 53 ms — h3https://www.readcube.com/wp-content/plugins/bbpowerpack/assets/css/owl.carousel.css?ver=2.40.10www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/bbpowerpack/assets/css/owl.carousel.css?ver=2.40.10 — 200 — 2.1 KiB — 47 ms — h3https://www.readcube.com/wp-content/plugins/bbpowerpack/assets/css/owl.theme.css?ver=2.40.10www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/bbpowerpack/assets/css/owl.theme.css?ver=2.40.10 — 200 — 1.3 KiB — 58 ms — h3https://www.readcube.com/wp-content/uploads/bb-plugin/cache/12-layout.css?ver=47d7a3a7180afcc5445d663421e1aa67www.readcube.com/wp-content/uploads... https://www.readcube.com/wp-content/uploads/bb-plugin/cache/12-layout.css?ver=47d7a3a7180afcc5445d663421e1aa67 — 200 — 14.1 KiB — 95 ms — h3https://www.readcube.com/wp-content/plugins/translatepress-multilingual/assets/css/trp-language-switcher.css?ver=3.1.4www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/translatepress-multilingual/assets/css/trp-language-switcher.css?ver=3.1.4 — 200 — 1.6 KiB — 67 ms — h3https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/css/all.min.css?ver=2.10.0.6www.readcube.com/wp-content/plugins... https://www.readcube.com/wp-content/plugins/bb-plugin/fonts/fontawesome/5.15.4/css/all.min.css?ver=2.10.0.6 — 200 — 14.2 KiB — 164 ms — 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h2https://cdn.cookielaw.org/logos/6a189e47-62e6-47b4-81b0-3ccd4f0bf2ab/7f541145-525f-4003-b6e1-131edbe83f4a/47a6fcb9-bc33-4937-b487-d848e5c95314/readcube_logo_dark.pngcdn.cookielaw.org/logos/6a189e47-62... https://cdn.cookielaw.org/logos/6a189e47-62e6-47b4-81b0-3ccd4f0bf2ab/7f541145-525f-4003-b6e1-131edbe83f4a/47a6fcb9-bc33-4937-b487-d848e5c95314/readcube_logo_dark.png — 200 — 7.8 KiB — 23 ms — h2https://cdn.cookielaw.org/logos/static/powered_by_logo.svgcdn.cookielaw.org/logos/static/powe... https://cdn.cookielaw.org/logos/static/powered_by_logo.svg — 200 — 2.7 KiB — 20 ms — h2https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2fonts.gstatic.com/s/poppins/v24/pxi... https://fonts.gstatic.com/s/poppins/v24/pxiByp8kv8JHgFVrLCz7Z1xlFd2JQEk.woff2 — 200 — 7.7 KiB — 5 ms — h3https://www.readcube.com/wp-content/uploads/2018/11/cropped-readucbe-icon-32x32.pngwww.readcube.com/wp-content/uploads... https://www.readcube.com/wp-content/uploads/2018/11/cropped-readucbe-icon-32x32.png — 200 — 2.0 KiB — 43 ms — h3
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 7719ms · 702KB · €84/mo
www.readcube.com
Other
Costly
Execution 1782ms
Transfer 21 KB
Monthly Cost €19/mo
Unattributable
Other
Costly
Execution 1037ms
Transfer 0 KB
Monthly Cost €11/mo
Google Tag Manager
Tag Manager
Costly
Execution 763ms
Transfer 154 KB
Unused 41%
Monthly Cost €8/mo
unpkg
CDN
Costly
Execution 661ms
Transfer 0 KB
Monthly Cost €7/mo
unpkg.co
Other
Costly
Execution 636ms
Transfer 0 KB
Monthly Cost €7/mo
www.readcube.com
Other
Costly
Execution 484ms
Transfer 0 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 459ms
Transfer 173 KB
Unused 40%
Monthly Cost €5/mo
OneTrust
Consent
Essential
Execution 457ms
Transfer 128 KB
Monthly Cost €5/mo
www.readcube.com
Other
Costly
Execution 437ms
Transfer 33 KB
Monthly Cost €5/mo
Google Tag Manager
Tag Manager
Costly
Execution 374ms
Transfer 146 KB
Unused 44%
Monthly Cost €4/mo
www.readcube.com
Other
Costly
Execution 301ms
Transfer 11 KB
Monthly Cost €3/mo
www.readcube.com
Other
Optional
Execution 93ms
Transfer 4 KB
Monthly Cost €1/mo
www.readcube.com
Other
Optional
Execution 70ms
Transfer 14 KB
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 64ms
Transfer 3 KB
Monthly Cost €1/mo
www.readcube.com
Other
Optional
Execution 51ms
Transfer 6 KB
Monthly Cost €1/mo
OneTrust
Consent
Essential
Execution 51ms
Transfer 9 KB
Monthly Cost €1/mo

These scripts may cost more than they're worth

  • www.readcube.com adds 1782ms and costs ~€19/month
  • Unattributable adds 1037ms and costs ~€11/month
  • Google Tag Manager adds 763ms and costs ~€8/month
  • unpkg adds 661ms and costs ~€7/month
  • unpkg.co adds 636ms and costs ~€7/month
  • www.readcube.com adds 484ms and costs ~€5/month
  • Google Tag Manager adds 459ms and costs ~€5/month
  • www.readcube.com adds 437ms and costs ~€5/month
  • Google Tag Manager adds 374ms and costs ~€4/month
  • www.readcube.com adds 301ms and costs ~€3/month

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more ▾

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

www.readcube.com takes 1782ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Unattributable takes 1037ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 763ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

unpkg takes 661ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

unpkg.co takes 636ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.readcube.com takes 484ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 459ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.readcube.com takes 437ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

Google Tag Manager takes 374ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

www.readcube.com takes 301ms of CPU time. Consider loading it asynchronously or replacing it with a lighter alternative.

Why this matters

This script has high main-thread execution time — optimize hot paths or defer.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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